Improvement in chucks



i UNITED STATESA PATENT OFFICE,-

FREDERICK VAN FLEET, OF WATSONTOWN, PENNSYLVANIA.

IMPROVEMENT iN cHucKs.

Specification forming part of Letters Patent No. 152,779, dated July 1874 g application filed May 5, 1874.

' To all whom it may concern: I

Be it known that I, FREDERICKy VAN FLEET, of Watsontown, in the county of Northumberland and State of Pennsylvania, have invented certain new and useful Improvements in Expanding Lathe Chuck, of which the following is a specification:

This invention relates to certain" improvements in lathe-chucks, in which the dogs are capable ofradial adjustment by means of a scroll-faced ring, adapted to threads in boxes, carrying the dogs in such a manner that, by turning said ring in one or the other direction, the dogs are correspondingly adjusted for admitting of the convenient adjustment of the chuck to concentric or eccentric work, as shown in the patent to J.'H. Vestcott, dated February 25, 1873,` No. 136,349. This invention consists `in constructing the face-plate of the chuck of three sections or parts, each provided with a tongue on its lower face,l having Ascrew threads formed thereon, which are adapted to a scrollfaced ring on the body of the chuck, for-adj ustin g the sections radially..

The said plates forming the face-plate of the chuck carry the dogs, which are adjustable radiallylby means of set-screws passing through openings in the body of the dogs, the said sliding sections and the dogs being capable of adjustment independent of each other, where by, when the sliding sections have been adj usted to their outer limit, the dogs can be afterward adjusted outwardly, and thus the chuck canbe expanded to'a niueh greater extent than heretofore.

Figure l is a top or plan view, showin g the .faceplate expanded, and dogs in position "wt-hercon; Fig. 2, a bottom view thereof; Fig.

8, a plan view, showing the faceplate eX- panded with the dogs removed; Fig. 4, a transversecentral section of the chuck 5 Fig, 5, a detached view of one ofthe sections ofthe face-plate.`

The body A of the chuck is provided with a face-plate, which is constructed of three sections or parts. B l5, and said sections are provided on` their inner face with rectangular tonguesfadapted to correspondhaving on their face sci'ew-threads-a, which are adapted to a scroll-faced ring,O, ar-

ing recesses in the body ofY the chuck, and

Yranged aroundthe periphery of the chuck,

and confined in place by a ring or disk, b, secured on the body of the chuck by screws c, and said ring or disk overlapping the scroll-faced ring (l, to permit the latter to revolve freely. The sections B of the faceplate of the chuck are provided with reetangular recesses D, in which are arranged 'thesliding dogs E, so as to move with the less than the rectangular recess D,'which is` for the purpose of confining in place the screw-bolts d, which latter are provided with two collars, c e', for this purpose.

The sections B of the face -plate of the chuck are always retained in a concentric positionf'with respect to the center of the chuck, by means of the scroll-ring C, by which they are adjusted radially; and the dogs may be conveniently adjusted by their screw-bolts to` adapt the chuck to concentric 0r eccentric work.

The dogs E are guided and retainedin place in the adjustable sections of the faceplate cf the chuck, with freedom of radial adjustment, either collectively or separately, by means of grooves on the same, and a corresponding construction of ribs on thc sections B.

In the operation of the chuck, the turning of the scroll-faced ring/effects a universal radial adjustment 'of the sections B of the faceplate, and afterward the dogs E have a radial movement indepondentof the sections.

XV ith a chuck in which the face-plaie is constructed of adjustable sections carrying the adjustable dogs, as above described, when the sections ofthe faceplate have been adjusted to their outward limit, the dogs then havefa movement independent of the sections, and the chuck can be expanded to a much greater degree than heretofore.

ldisclaiin the invention illustrated in t-he patent of Westcotabefore referred to.

I cla-ini as myinventionvThe faceplate of the chuck, constructed ol' in the recesses, and with the scroll-faced ring day of March, 1874.

the radially-sliding sections B,hzwng recesses In testimony that I claim the foregoing I D, in combination with the dogs E, arranged have hereunto set my hand and seal this 14th G, the Whole being eenstrueted, and the sld- FRED. VAN FLEET. [L s1] in g sections and dogs being capable of adjust- Witnesses: ment` independent of each other, substantially THOMAS WALTER HARDY, as described, and for the purpose speeied. THOMAs B.y MCOARTHY.

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